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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
![Traniello and his colleagues demonstrated that social insects may develop “social imm](https://biology-forums.com/gallery/47/medium_33_01_08_11_10_47_28_1303845.jpeg)
![Three Tasmanian devils feeding. Eating is a social event for the Tasmanian devil, and groups of 2 to](https://biology-forums.com/gallery/47/medium_27692_23_04_12_4_15_26.jpeg)